Filtered Varchenko–Gelfand algebras are invariant under a Cremona coefficient swap for two-coordinate arrangements, producing a counterexample to the Yagi–Yoshinaga tope-graph conjecture.
and Gr\"unbaum, Branko and Sloane, N
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Cremona invariance of filtered Varchenko--Gelfand algebras
Filtered Varchenko–Gelfand algebras are invariant under a Cremona coefficient swap for two-coordinate arrangements, producing a counterexample to the Yagi–Yoshinaga tope-graph conjecture.